Added 2state debugging

app/src/main/java/eu/faircode/email/Log.java

@@ -2212,9 +2212,10 @@ public class Log {
         long size = 0;
         File file = attachment.getFile(context);
         try (OutputStream os = new BufferedOutputStream(new FileOutputStream(file))) {
-            for (SimpleTask task : SimpleTask.getList()) {
+            for (SimpleTask task : SimpleTask.getList())
                 size += write(os, String.format("%s\r\n", task.toString()));
-            }
+            for (TwoStateOwner owner : TwoStateOwner.getList())
+                size += write(os, String.format("%s\r\n", owner.toString()));
         }
 
         db.attachment().setDownloaded(attachment.id, size);

app/src/main/java/eu/faircode/email/TwoStateOwner.java

@@ -26,19 +26,36 @@ import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.LifecycleRegistry;
 import androidx.lifecycle.OnLifecycleEvent;
 
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
 import java.util.Objects;
 
 // This class can be used as an externally controlled standalone or child life cycle owner
 
 public class TwoStateOwner implements LifecycleOwner {
     private String name;
+    private boolean owned = true;
     private Object condition;
     private LifecycleRegistry registry;
+    private long created;
+    private long changed;
+
+    private static DateFormat DTF = SimpleDateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
+
+    private static List<TwoStateOwner> list = new ArrayList<>();
+
+    static List<TwoStateOwner> getList() {
+        return list;
+    }
 
     // https://developer.android.com/topic/libraries/architecture/lifecycle#lc
 
     TwoStateOwner(String aname) {
         name = aname;
+        created = new Date().getTime();
         create();
     }
 
@@ -49,23 +66,32 @@ public class TwoStateOwner implements LifecycleOwner {
         owner.getLifecycle().addObserver(new LifecycleObserver() {
             @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
             public void onDestroyed() {
-                Log.d("LifeCycle " + name + " parent destroyed");
+                Log.i(this + " parent destroyed");
+                owned = false;
                 destroy();
+                owner.getLifecycle().removeObserver(this);
             }
         });
     }
 
     private void create() {
-        // Initialize
+        if (owned) {
-        registry = new LifecycleRegistry(this);
+            // Initialize
-        registry.addObserver(new LifecycleObserver() {
+            registry = new LifecycleRegistry(this);
-            @OnLifecycleEvent(Lifecycle.Event.ON_ANY)
+            registry.addObserver(new LifecycleObserver() {
-            public void onAny() {
+                @OnLifecycleEvent(Lifecycle.Event.ON_ANY)
-                Log.d("LifeCycle " + name + " state=" + registry.getCurrentState() + " " + registry);
+                public void onAny() {
-            }
+                    Log.i(this + " " + registry);
-        });
+                    changed = new Date().getTime();
+                }
+            });
 
-        setState(Lifecycle.State.CREATED);
+            setState(Lifecycle.State.CREATED);
+            synchronized (list) {
+                list.add(this);
+            }
+        } else
+            Log.i(this + " not owned");
     }
 
     void start() {
@@ -103,6 +129,9 @@ public class TwoStateOwner implements LifecycleOwner {
             if (!state.equals(Lifecycle.State.CREATED))
                 setState(Lifecycle.State.CREATED);
             setState(Lifecycle.State.DESTROYED);
+            synchronized (list) {
+                list.remove(this);
+            }
         }
     }
 
@@ -131,4 +160,13 @@ public class TwoStateOwner implements LifecycleOwner {
              */
         }
     }
+
+    @Override
+    public String toString() {
+        return "TwoStateOwner " + name +
+                " state=" + registry.getCurrentState() +
+                " owned=" + owned +
+                " created=" + DTF.format(created) +
+                " change=" + DTF.format(changed);
+    }
 }